Adaptive Scaling Active Constellation Extension Scheme with Fast Convergence for PAPR Reduction in OFDM/OQAM Signals

Vangala, Sandeepkumar, Le Minh, Hoa, Aslam, Nauman, Raza, Mohsin and Pham, Anh T. (2019) Adaptive Scaling Active Constellation Extension Scheme with Fast Convergence for PAPR Reduction in OFDM/OQAM Signals. In: VTC-Fall 2018 - 2018 IEEE 88th Vehicular Technology Conference, 27th - 30th August 2018, Chicago, Detroit.

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Abstract

Active Constellation Extension (ACE) is widely used to reduce Peak-to-Average Power Ratio (PAPR) in Offset Quadrature Amplitude Modulation based Orthogonal Frequency Division Multiplexing (OFDM/OQAM). To improve overall performance and energy efficiency in OFDM/OQAM systems, this paper proposes Adaptive Scaling (AS) for effective ACE (AS-ACE). The proposed scheme exploits the overlapping structure of the OFDM/OQAM signals and jointly considers adjacent data blocks to obtain the clipping noise. The proposed scheme adaptively extends the constellation points to effectively eliminate peaks in OFDM/OQAM signals. This is achieved by using peak samples of clipping noise, used to generate the peak correcting signal. Least square approximation algorithm is used to fit the waveform of peak correcting signal to the waveform of clipping noise without any decrease in the constellation distance. Simulation results show that the AS-ACE reduces PAPR and Bit Error Rate (BER) and improves convergence speed compared to OSGP technique without requiring increased processing or additional information at the receiver end.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Active Constellation Extension (ACE), Adaptive Scaling (AS), Overlapping Smart Gradient Projection (OSGP), Peak Average Power Ratio (PAPR)
Subjects:	H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Computer and Information Sciences
Depositing User:	Paul Burns
Date Deposited:	20 May 2019 09:52
Last Modified:	10 Oct 2019 18:48
URI:	http://nrl.northumbria.ac.uk/id/eprint/39349

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